在 2019年12月26日 +0800 PM8:59，Alan Third <alan@idiocy.org>，写道：

The issue seems to rely on the combination of truncate lines mode,
global hl mode and tabs on the left. The number of tabs seems to make
no difference, the offset remains the same, and replacing tabs with
spaces displays correctly.

It seems that it happens when the leftmost tab char stays across the left border.